NOTES
APRIL 1967
of the solid products were isolated from the reaction mixtures and identified by mixture melting points. All melting points are corrected. Pentafluoroiodobenzene and Nickel Carbonyl in TKF.Pentafluoroiodobenzene (29 g, 0.1 mole) was refluxed with nickel carbonyl (17 g, 0.1 mole) in 50 ml of T H F until the boiling point of the mixture had reached 67". The dark solution was diluted with water (200 ml, and hydrochloric acid (10 ml), extracted with benzene, and dried (Na2S04); the benzene was distilled on a steam bath. The remaining oil was distilled,in vacuo using a short column giving pentafluoroiodobenzene (17.2 g, 597,). Repeated recrystallization of the residue from heptane gave I1 ( 2 . 5 g, 37S,j, mp 69"-70". Evaporation of the mother liquor gave an oily residue; its infrared spectrum showed a band in the 1700-cm-' region ( CbFb-C=O). Pentafluoroiodobenzene and Nickel Carbonyl in DMF.Pentafluoroiodobenzene (5
